An electric spindle shaft core, electric spindle and motor

Abstract

The application relates to the technical field of motors, and discloses an electric spindle core, an electric spindle and a motor, which comprise a heat exchange part; a plurality of heat exchange holes are arranged in the heat exchange part, the heat exchange holes are uniformly distributed along the axis of the heat exchange part, and the cross section of the heat exchange hole is in a polygonal shape; the heat exchange part further comprises a connecting part used for connecting an air inlet assembly, the connecting part and the heat exchange part are sequentially arranged along a first direction, a recovery cavity is formed between the connecting part and the heat exchange part, the heat exchange holes are communicated with the recovery cavity, and a connecting hole is arranged at the other end of the connecting part; the air inlet assembly comprises an air inlet pipe, the air inlet pipe sequentially passes through the connecting hole and the recovery cavity and is communicated with the heat exchange hole. The electric spindle core, the electric spindle and the motor increase the contact area between the gas and the spindle core, make the gas more uniformly dispersed in the spindle core, enhance the heat transfer between the gas and the spindle core, improve the uniformity of cooling, and effectively improve the heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to an electric spindle core, an electric spindle, and a motor. Background Technology

[0002] An electric spindle, also known as a motor spindle, is the power source for an electric motor. Connected to the motor rotor, the spindle converts the electromagnetic energy generated by the motor into mechanical energy and transfers it to the load. In high-precision and high-speed applications, the electric spindle is typically equipped with a cooling system to prevent overheating caused by the heat generated during high-speed rotation (the electric spindle is connected to bearings, which maintain the smoothness of rotation; however, due to high-speed rotation, friction between the bearings and the electric spindle generates a large amount of heat). The cooling system, through heat exchange holes and airflow path design, introduces cooling gas into the spindle core, removes the heat, and then exhausts it.

[0003] Currently, when cooling the motor spindle, a cooling channel is opened in the spindle core, and cooling gas is introduced to assist in cooling the motor spindle. The existing cooling channel design is usually linear, that is, the cooling gas is introduced in a straight line and then discharged. This results in a limited contact area between the cooling gas and the spindle core, low heat exchange efficiency, and inability to fully remove the heat generated inside the spindle core. Furthermore, because the cooling gas has a single flow path, the cooling gas cannot be evenly distributed during the flow process, resulting in uneven temperature distribution inside the spindle core, severe local overheating, and affecting the service life of the motor spindle. Summary of the Invention

[0004] The purpose of this invention is to provide an electric spindle core, an electric spindle, and a motor, which increases the contact area between the gas and the core, and makes the gas more evenly dispersed in the core, thereby enhancing the heat transfer between the gas and the core, improving the uniformity of cooling, and effectively improving the heat exchange efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] Design an electric spindle core, including a heat exchange section;

[0007] The heat exchange section is provided with a plurality of heat exchange holes, which are evenly distributed along the axis of the heat exchange section, and the cross-section of the heat exchange holes is polygonal.

[0008] It also includes a connecting part for connecting the air intake assembly, the connecting part and the heat exchange part are arranged sequentially along the first direction, and a recovery chamber is formed between the connecting part and the heat exchange part, and a plurality of heat exchange holes are connected to the recovery chamber, and a connecting hole is provided at the other end of the connecting part;

[0009] The air intake assembly includes an air intake pipe, which passes through a connecting hole and a recovery chamber in sequence and communicates with a heat exchange hole.

[0010] Optionally, it also includes a drive unit for connecting the driven component. The heat exchange unit and the drive unit are arranged sequentially along a first direction. The end of the drive unit facing the heat exchange unit has a dispersion cavity. The ends of the plurality of heat exchange holes away from the recovery cavity are all connected to the dispersion cavity. The outlet end of the air inlet pipe passes through the heat exchange holes and is located in the dispersion cavity.

[0011] Optionally, the driving unit includes a driving shaft core, the dispersion cavity is opened in the driving shaft core, and a dispersion block is fixedly connected to the bottom of the dispersion cavity along the first direction. The dispersion block is arranged in a conical shape.

[0012] Optionally, the air intake assembly further includes an air intake hood, which is fixedly connected to one end of the air intake pipe and located in the dispersion chamber. The air outlet end of the air intake hood corresponds to the dispersion block along the first direction. The other end of the air intake pipe is connected to an air source, and an air outlet assembly is rotatably connected to the outer surface of the air intake pipe.

[0013] Optionally, the exhaust assembly includes a recovery sleeve, one end of which is fitted onto the outer surface of the intake pipe through an opening, and the other end of which is fixedly connected to the inner wall of the connection hole and spaced apart from the intake pipe. The intake pipe has multiple blades arranged circumferentially on its outer surface inside the recovery sleeve, and the outer surface of the recovery sleeve has an exhaust hole.

[0014] Optionally, a splicing flange is fixedly connected to the outer surface of the drive shaft core, and the drive shaft core is detachably connected to the driven component through the splicing flange.

[0015] Optionally, the connecting part includes a connecting shaft core for fixed connection with the rotor. The recovery chamber and the connecting hole are both disposed inside the connecting shaft core. The inner wall of the recovery chamber is inclined along the first direction to the centerline of the connecting shaft core. The diameter of one end of the recovery chamber is smaller than the diameter of the other end. The end of the recovery chamber with a larger diameter communicates with a plurality of heat exchange holes, and the end of the recovery chamber with a smaller diameter communicates with the connecting hole.

[0016] Optionally, the heat exchange section includes a heat exchange shaft core for connection with the bearing, a plurality of heat exchange holes are formed in the heat exchange shaft core, the cross-section of the heat exchange holes is hexagonal and the included angle between adjacent sides is 120 degrees, and the outer surface of the heat exchange shaft core is coated with a wear-resistant ceramic layer corresponding to the bearing.

[0017] An electric spindle includes an electric spindle core as described above.

[0018] An electric motor, comprising an electric spindle as described above.

[0019] This invention provides an electric spindle core, an electric spindle, and a motor, which have the following beneficial effects:

[0020] The electric spindle core, electric spindle, and motor deliver cooling gas to several heat exchange holes in the heat exchange section via an air inlet pipe after passing through the connecting hole and the recovery chamber. The evenly distributed heat exchange holes allow the cooling gas to be uniformly and effectively dispersed throughout the entire heat exchange section under centrifugal force. As the cooling gas flows through the heat exchange holes, it absorbs heat from the heat exchange section, carries away thermal energy, and lowers the temperature of the spindle core. After completing the heat exchange process in the heat exchange holes, the cooling gas is re-collected through the recovery chamber and discharged from there. The polygonal arrangement of the heat exchange holes not only increases the contact area between the gas and the heat exchange section, but also, combined with the rotation of the heat exchange section during use, disturbs the airflow through centrifugal force, further dispersing the gas more evenly within the heat exchange section. This enhances heat transfer between the gas and the spindle core, improves cooling uniformity, and effectively increases heat exchange efficiency. Furthermore, the polygonal structural design reduces the overall weight of the heat exchange section, improving the dynamic performance and stability of rotation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the mounting structure of the electric spindle core in this invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the electric spindle core in this invention;

[0023] Figure 3 This is a cross-sectional structural schematic diagram of the electric spindle core in this invention;

[0024] Figure 4 This is a schematic cross-sectional view of the electric spindle core in this invention.

[0025] In the diagram: 100, heat exchange section; 110, heat exchange hole; 120, heat exchange shaft core; 130, wear-resistant ceramic layer; 200, air intake assembly; 210, air intake pipe; 220, air intake hood; 230, blade; 300, connecting part; 310, recovery chamber; 320, connecting shaft core; 330, connecting hole; 400, drive part; 410, dispersion chamber; 420, drive shaft core; 430, dispersion block; 440, splicing flange; 500, air outlet assembly; 510, recovery sleeve; 520, exhaust hole. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] This invention provides a motor spindle core, which is used in driving scenarios. In this embodiment, the structure of the motor spindle core is improved to give it the advantage of uniform heat dissipation. The motor spindle core is also known as an electric spindle core.

[0028] Please see Figures 1 to 4 The present invention provides a technical solution: an electric spindle core, including a heat exchange section 100;

[0029] The heat exchange section 100 is provided with a plurality of heat exchange holes 110, which are evenly distributed along the axis of the heat exchange section 100, and the cross-section of the heat exchange holes 110 is polygonal.

[0030] It also includes a connecting part 300 for connecting the air intake assembly 200. The connecting part 300 and the heat exchange part 100 are arranged sequentially along the first direction, and a recovery chamber 310 is formed between the connecting part 300 and the heat exchange part 100. A plurality of heat exchange holes 110 are connected to the recovery chamber 310. A connecting hole 330 is provided at the other end of the connecting part 300.

[0031] The intake assembly 200 includes an intake pipe 210, which passes through a connection hole 330 and a recovery chamber 310 in sequence and communicates with a heat exchange hole 110.

[0032] The heat exchange holes 110 are evenly distributed along the axis of the heat exchange section 100, increasing the surface area in contact with the gas and thus improving the heat exchange efficiency. The cross-section of the heat exchange holes 110 is polygonal, which can create a turbulence effect and improve the heat exchange efficiency when the gas flows through. The polygonal cross-section reduces the weight of the overall structure of the heat exchange section 100. The reduced weight can result in better acceleration and deceleration performance, and improve the dynamic performance and stability of rotation (i.e., high strength and rigidity, especially in the middle section of the shaft, which can effectively improve the bending and torsional resistance of the shaft). The recovery cavity 310 formed between the connecting part 300 and the heat exchange section 100 serves to collect gas, and the connecting hole 330 provides a mounting position for the air inlet pipe 210. The air intake pipe 210 is stably connected to the shaft core. The air intake pipe 210 allows the airflow to pass smoothly through the connecting hole 330 and the recovery chamber 310, and directly enter the heat exchange hole 110 for heat exchange. After the heat exchange is completed, the airflow first enters the heat exchange hole 110 and then fills the heat exchange hole 110. Then it gathers in the recovery chamber 310 and is discharged through the connecting hole 330. Through the action of the recovery chamber 310, the positive pressure effect is used, that is, the gas in the recovery chamber 310 accumulates more and more, so that the gas in the recovery chamber 310 is squeezed out through the connecting hole 330, so that the gas can stay in the heat exchange hole 110 for a long time before being discharged, reducing the generation of boundary layer and reducing heat dissipation efficiency.

[0033] In this embodiment, as a preferred option, it further includes a drive unit 400 for connecting the driven component. The heat exchange unit 100 and the drive unit 400 are arranged sequentially along a first direction. The drive unit 400 has a dispersion cavity 410 at its end facing the heat exchange unit 100. The ends of several heat exchange holes 110 away from the recovery cavity 310 are all connected to the dispersion cavity 410. The outlet end of the air inlet pipe 210 passes through the heat exchange holes 110 and is located inside the dispersion cavity 410. The drive unit 400 is used to connect the driven component, ensuring that the electric spindle core can be reliably connected to the driven component. The drive unit 400 undertakes the functions of mechanical connection and power transmission, and also achieves uniform distribution and dispersion of cooling gas through its internal dispersion cavity 410. The cavity 410 ensures that the cooling gas can be evenly dispersed before entering the heat exchange hole 110, avoiding excessive local flow and improving the overall heat exchange efficiency. The end of the heat exchange hole 110 away from the recovery cavity 310 is connected to the dispersion cavity 410. The evenly distributed heat exchange holes 110 obtain cooling gas through the dispersion cavity 410, so that the gas can flow evenly through each heat exchange hole 110, ensuring uniform temperature distribution in the heat exchange section 100 and preventing local overheating. The outlet end of the air inlet pipe 210 is located in the dispersion cavity 410. By using centrifugal force and the cavity structure, the cooling gas is more evenly dispersed into the heat exchange hole 110, preventing excessive or insufficient local flow and improving the heat exchange effect.

[0034] Through the cooperation of the intake pipe 210, dispersion chamber 410, heat exchange hole 110 and recovery chamber 310, efficient cooling and stable airflow distribution are achieved. The outlet end of the intake pipe 210 is located in the dispersion chamber 410. Centrifugal force and the chamber structure are used to evenly disperse the cooling gas into the heat exchange hole 110, preventing excessive or insufficient local flow, thereby improving the overall heat exchange effect. The polygonal cross-section of the heat exchange hole 110 increases the contact area and turbulence effect between the gas and the shaft core, further enhancing the heat exchange efficiency. The setting of the recovery chamber 310 ensures the effective recovery and recirculation of the cooling gas and provides a stable airflow path.

[0035] In this embodiment, as a preferred option, the air intake assembly 200 further includes an air intake hood 220. The air intake hood 220 is fixedly connected to one end of the air intake pipe 210 and located inside the dispersion chamber 410. The air outlet end of the air intake hood 220 corresponds to the dispersion block 430 along the first direction. The other end of the air intake pipe 210 is connected to an air source. An air outlet assembly 500 is rotatably connected to the outer surface of the air intake pipe 210. The air outlet end of the air intake hood 220 corresponds to the dispersion block 430 along the first direction. The air intake hood 220, in conjunction with the dispersion block 430, directs the air intake... The cooling gas delivered by the air pipe 210 is evenly distributed into the dispersion chamber 410. That is, the gas output through the air inlet hood 220 contacts the dispersion block 430, or rather, impacts the dispersion block 430. The dispersion block 430 evenly distributes the heat dissipation gas delivered by the air inlet pipe 210 into the dispersion chamber 410. In other words, the heat dissipation gas flows in all directions, which improves the uniformity of heat dissipation gas distribution and ensures the consistency of airflow in each heat exchange hole 110 as much as possible, avoiding excessive or insufficient local flow and improving the overall heat exchange efficiency.

[0036] In this embodiment, as a preferred option, the air outlet assembly 500 includes a recovery sleeve 510. One end of the recovery sleeve 510 is fitted onto the outer surface of the air inlet pipe 210 through an opening. The other end of the recovery sleeve 510 is fixedly connected to the inner wall of the connection hole 330 and is spaced apart from the air inlet pipe 210. Multiple blades 230 are circumferentially arranged on the outer surface of the air inlet pipe 210 located inside the recovery sleeve 510. An exhaust hole 520 is opened on the outer surface of the recovery sleeve 510.

[0037] Through the action of the recovery sleeve 510, gas enters the dispersion chamber 410 through the air inlet hood 220, and then enters the recovery chamber 310 through the heat exchange hole 110. The recovery sleeve 510 is located at one end of the recovery chamber 310 and is spaced apart from the air inlet pipe 210. The gas entering the recovery chamber 310 then enters the recovery sleeve 510 and is discharged through the exhaust hole 520 on the recovery sleeve 510. The blades 230 set in the air inlet pipe 210 are in a relative rotational relationship with the recovery sleeve 510. When the recovery sleeve 510 rotates, the inner wall of the recovery sleeve 510 and the blades 230 cooperate to generate a negative pressure, which can draw out the gas in the recovery chamber 310 and then discharge it through the exhaust hole 520, thereby increasing the speed of gas discharge from the recovery chamber 310 and further improving the heat dissipation efficiency. Through the connection between the recovery sleeve 510 and the connecting hole 330, the recovery sleeve 510 can rotate with the connecting part 300.

[0038] One end of the blade 230 is fixedly connected to the intake pipe 210, and the other end of the blade 230 is inclined in the direction of rotation or the opposite direction of rotation. Therefore, when the rotating sleeve 510 rotates relative to the blade 230, negative pressure can be generated. This is a known technology and is only cited here.

[0039] In this embodiment, as a preferred solution, a splicing flange 440 is fixedly connected to the outer surface of the drive shaft core 420, and the drive shaft core 420 is detachably connected to the driven component through the splicing flange 440.

[0040] The drive shaft core 420 is detachably connected to the driven assembly via a splicing flange 440. The splicing flange 440 provides a stable connection interface, enabling the drive shaft core 420 to reliably connect to the driven assembly. The detachable design makes the driven assembly easy to install and remove, facilitating maintenance and replacement. The design of the splicing flange 440 ensures the stability and strength of the connection, while simplifying the installation and maintenance process, improving the maintainability and flexibility of the system, and ensuring that the electric spindle core can stably transmit power. A dispersion cavity 410 formed on the drive shaft core 420 is used for distributing... The driven assembly receives power from the drive shaft core 420 via the splicing flange 440 and transmits it to other mechanical components. The design of the driven assembly and the splicing flange 440 ensures the reliability and efficiency of power transmission, reduces wear and power loss between mechanical components, and allows for quick disassembly and replacement of the drive shaft core 420 and the driven assembly through the connection of the splicing flange 440. This improves the flexibility of use and allows for quick replacement of the driven assembly or the drive shaft core 420 according to actual needs, adapting to different working environments and processing requirements.

[0041] In this embodiment, as a preferred option, the connecting part 300 includes a connecting shaft core 320 for fixed connection with the rotor. The recovery cavity 310 and the connecting hole 330 are both disposed in the connecting shaft core 320. The inner wall of the recovery cavity 310 is inclined along the first direction to the centerline of the connecting shaft core 320. The diameter of one end of the recovery cavity 310 is smaller than the diameter of the other end. The end of the recovery cavity 310 with a larger diameter communicates with a plurality of heat exchange holes 110, and the end of the recovery cavity 310 with a smaller diameter communicates with the connecting hole 330.

[0042] The connecting shaft core 320 provides a channel for mechanical connection and power transmission, enabling the electric spindle core to stably receive power from the drive motor (connected to the rotor; the rotor rotates through electromagnetic interaction between the rotor and stator, a known technology; power is transmitted to the connecting shaft core 320 via the rotor, thus causing the electric spindle core to rotate). The connecting shaft core 320 contains a recovery chamber 310 and a connecting hole 330, forming a flow path for cooling gas discharge. The smaller diameter end of the recovery chamber 310 communicates with the connecting hole 330, while the larger diameter end connects with several heat exchangers. The orifice 110 is connected, and the inclined design of the inner wall allows the airflow to gradually accelerate within the recovery chamber 310. The inclination and diameter change help to gradually gather and guide the cooling gas, ensuring a smooth transition of the airflow, improving the flow efficiency of the cooling gas, reducing airflow resistance and turbulence, optimizing the recovery and recirculation process of the cooling gas, and improving the overall heat exchange efficiency. The gas entering the recovery chamber 310 is discharged through the connecting hole 330. Through the optimized airflow path and stable power transmission, the electric spindle can maintain good dynamic response performance during operation.

[0043] The air source can be a blower or an air pump, both of which are existing and well-known technologies. They are only cited here for the purpose of generating airflow through the air intake pipe.

[0044] In this embodiment, as a preferred option, the heat exchange section 100 includes a heat exchange shaft core 120 for connection with the bearing, a plurality of heat exchange holes 110 are formed in the heat exchange shaft core 120, the cross-section of the heat exchange holes 110 is hexagonal, the included angle between adjacent sides is 120 degrees, and the outer surface of the heat exchange shaft core 120 is coated with a wear-resistant ceramic layer 130 corresponding to the bearing.

[0045] The heat exchange core 120 is used to connect with the bearing, providing rotational support and ensuring stable operation of the electric spindle core. The hexagonal heat exchange hole 110 design increases the heat exchange area, enhances the flow of cooling gas, improves the heat exchange efficiency of the cooling gas, ensures effective heat dissipation of the core under high-temperature operating conditions, and increases the strength and rigidity of the structure. The hexagonal heat exchange hole 110 provides a larger surface area, increasing the contact area between the gas and the core, and helps to achieve uniform airflow distribution, reducing airflow resistance and turbulence, thus enhancing heat exchange efficiency. This allows the cooling gas to more effectively remove heat from the core, and also improves the strength and rigidity of the structure, enabling it to better withstand mechanical stress, reduce deformation, and improve the stability and durability of the electric spindle core. The coating of the wear-resistant ceramic layer 130 reduces friction and wear between the electric spindle core and the bearing. The wear resistance and high-temperature resistance of the ceramic layer improve the durability of the electric spindle core and extend its service life.

[0046] In this embodiment, during use, cooling gas enters the dispersion chamber 410 through the intake pipe 210 of the intake assembly 200. The intake shroud 220 and the dispersion block 430 cooperate to evenly distribute the gas into the heat exchange hole 110 (i.e., the gas impacts the dispersion block 430 after being discharged through the intake shroud 220), ensuring uniform distribution of cooling gas and preventing excessive or insufficient local flow. This ensures uniform temperature distribution within the heat exchange section 100 and prevents local overheating. When the cooling gas passes through the heat exchange hole 110, it absorbs heat from the shaft core. The polygonal cross-sectional design of the heat exchange hole 110 increases the contact area between the gas and the shaft core, creating a turbulent effect and improving heat exchange efficiency. The heat-exchanged gas gathers in the recovery chamber 310 and then enters the recovery chamber. The gas gradually accumulates in the heat exchange chamber 310 and is discharged through the connecting hole 330. The relative rotation of the blades 230 of the heat exchange sleeve 510 and the inlet pipe 210 generates negative pressure, accelerating the gas discharge. The polygonal cross-section reduces the overall weight of the heat exchange section 100, improves the acceleration and deceleration performance of the main shaft, and enhances the dynamic performance and stability of rotation. The outer surface of the heat exchange shaft core 120 is coated with a wear-resistant ceramic layer 130, which reduces friction and wear between the core and the bearing, improves the durability of the core, and extends its service life. The inclined design and diameter variation of the inner wall of the heat exchange chamber 310 ensure a smooth transition of airflow and improve the flow efficiency of the cooling gas. Due to the weight reduction, energy consumption is also reduced, thus achieving energy saving.

[0047] The present invention also provides an electric spindle, including the electric spindle core as described above, and may further include a seal for protecting the bearing.

[0048] The present invention also provides an electric motor, including the electric spindle as described above, which is prior art and is only referenced here. It includes a rotor, a stator and an electric spindle. The rotor is fixedly connected to the outer surface of the electric spindle. It generates rotational force through electromagnetic effect in conjunction with the stator. The fixed connection with the outer surface of the electric spindle drives the electric spindle to rotate, thereby realizing power transmission.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electrospindle shaft core, characterized by: The heat exchange part (100) comprises a heat exchange part (100); A plurality of heat exchange holes (110) are arranged in the heat exchange part (100), the plurality of heat exchange holes (110) are uniformly distributed along the axis of the heat exchange part (100), and the cross section of the heat exchange hole (110) is polygonal; The connecting part (300) is arranged in sequence with the heat exchange part (100) along the first direction, and the connecting part (300) and the heat exchange part (100) form a recovery cavity (310) therebetween, the plurality of heat exchange holes (110) are communicated with the recovery cavity (310), and the other end of the connecting part (300) is provided with a connecting hole (330); The air inlet assembly (200) comprises an air inlet pipe (210), the air inlet pipe (210) passes through the connecting hole (330) and the recovery cavity (310) in sequence and is communicated with the heat exchange hole (110); The driving part (400) is arranged in sequence with the heat exchange part (100) along the first direction, an end of the driving part (400) towards the heat exchange part (100) is provided with a dispersion cavity (410), one end of the plurality of heat exchange holes (110) away from the recovery cavity (310) is communicated with the dispersion cavity (410), and the air outlet end of the air inlet pipe (210) is located in the dispersion cavity (410) through the heat exchange hole (110); The driving part (400) comprises a driving shaft core part (420), the dispersion cavity (410) is arranged in the driving shaft core part (420), the dispersion cavity (410) is fixedly connected with a dispersion block (430) at the bottom along the first direction, and the dispersion block (430) is conical. The air inlet assembly (200) further comprises an air inlet cover (220), the air inlet cover (220) is fixedly connected to one end of the air inlet pipe (210) and located in the dispersion cavity (410), the air outlet end of the air inlet cover (220) corresponds to the dispersion block (430) along the first direction, the other end of the air inlet pipe (210) is connected with a gas source, and the outer surface of the air inlet pipe (210) is rotatably connected with an air outlet assembly (500).

2. An electric spindle core according to claim 1, characterized in that: The air outlet assembly (500) comprises a recovery sleeve (510), one end of the recovery sleeve (510) is sleeved on the outer surface of the air inlet pipe (210) through the arranged hole, the other end of the recovery sleeve (510) is fixedly connected to the inner wall of the connecting hole (330) and is spaced apart from the air inlet pipe (210), the outer surface of the air inlet pipe (210) located in the recovery sleeve (510) is circumferentially provided with a plurality of blades (230), and the outer surface of the recovery sleeve (510) is provided with an exhaust hole (520).

3. An electric spindle core according to claim 1, characterized in that: The outer surface of the driving shaft core part (420) is fixedly connected with a splicing flange (440), and the driving shaft core part (420) is detachably connected with the driven assembly through the splicing flange (440).

4. An electric spindle core according to claim 1, characterized in that: The connecting part (300) comprises a connecting shaft core (320) for fixed connection with the rotor, the recovery cavity (310) and the connecting hole (330) are arranged in the connecting shaft core (320), the inner wall of the recovery cavity (310) is arranged in an inclined manner along a first direction with respect to the center line of the connecting shaft core (320), the diameter of one end of the recovery cavity (310) is smaller than that of the other end, the end of the recovery cavity (310) with the larger diameter is communicated with the plurality of heat exchange holes (110), and the end of the recovery cavity (310) with the smaller diameter is communicated with the connecting hole (330).

5. An electric spindle core according to claim 1, characterized in that: The heat exchange part (100) comprises a heat exchange shaft core (120) for connection with the bearing, the plurality of heat exchange holes (110) are arranged in the heat exchange shaft core (120), the cross section of the heat exchange hole (110) is arranged in a hexagonal shape, the included angle of adjacent sides is 120 degrees, and the outer surface of the heat exchange shaft core (120) is coated with a wear-resistant ceramic layer (130) corresponding to the bearing.

6. An electric spindle characterized by: An electric spindle shaft core comprising any one of claims 1-5.

7. An electric machine characterized by: An electric spindle comprising claim 6.

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